Mercedes-Benz GLS is available with two engine options - 3.0-litre petrol and a 3.0-litre diesel engine that makes 333bhp and 258bhp, respectively. Both engines come mated to a 9-speed automatic transmission. The petrol engine delivers a claimed fuel efficiency of 8.9 kmpl while the diesel engine has a bit better claimed figures at 11 kmpl.
For the availability, we would suggest you walk into the nearest dealership as they will be the better person to assist you because it depends on their stock book. You can click on the following link to see the details of the nearest dealership and selecting your city accordingly - Car Showrooms